To vacate an area of space in a matter of nanoseconds or with ninja like speed. A shink is only successful when the person shinking is not detected in the slightest and makes other people believe they vanished into thin air.

Human 1: "Damn dude I've got all this paper work to finish by 5:00 but I honestly couldn't be fucked!!"

Human 2: "What are you going to do?"

Human 1: "I'm thinking I'm going to shink the fuck out of here and make up some bullshit story tomorrow on why it hasn't been finished"

Human 2: "are you confident you'll get away with it?"

Human 1: "brother please, i've been shinking since you were an itch in your daddy's pants...bye bye."